Friday, 2018-05-18

« Thursday, 2018-05-17 Index Saturday, 2018-05-19 »
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kata-dev-irc-bot<bergwolf> @stefanha Does fedora act different? I did test initramfs with alpine and centos rootfs and they do not require udev to create `/dev/virtio-ports`, which thus I assumed is created by the kernel instead.04:31
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kata-dev-irc-bot<caihaomin> @bergwolf @james.o.hunt @eric.ernst https://github.com/kata-containers/runtime/pull/299 ready to merge~~ CI is green now!  thx~06:56
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stefanhaAny tips on debugging the Kata VM if QEMU doesn't launch or the guest powers down quickly?  In those cases I don't get useful syslog output from the runtime.12:57
stefanhaIdeally I'd like to see the VM's console output and disable the "quiet" kernel parameter.12:57
stefanhaSo far I've run Kata's QEMU command-line manually so I could debug things.  It works manually now but is still silent when run under Kata, so I need to start debugging it within Kata.12:59
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devimcstefanha, https://gist.github.com/devimc/f8e3373d8d8e6b3b5b56441d04875f2a13:10
devimccould be useful13:10
stefanhadevimc: Thanks!  I was wondering what console.sock was for and never got any output from it :)13:11
devimcstefanha, if you want to attach to console.sock you need to disable debugging in config file13:12
stefanhadevimc: Great, will try that!13:12
devimcand you need a custom kata image13:12
devimctake a look to osbuilder13:12
stefanhadevimc: Okay, I am already building my own.13:12
stefanhadevimc: Why is a custom image necessary?  I remember the debug options being in the kata runtime configuration file, so how does the image come into play?13:13
devimcstefanha, you need bash in the image to attach to console.sock and have a prompt13:14
devimcalso once you have the image13:14
devimcyou should modify the kata service13:14
devimchttps://gist.github.com/devimc/f8e3373d8d8e6b3b5b56441d04875f2a#to-debug-cc-agent-through-consolesock-add-next-line-to-cc-agenttarget-cc-2x-or-clear-containerstarget-cc-3013:14
stefanhadevimc: I see, thanks!13:14
devimcto include a service that will start bash13:14
devimconce you are attached to console.sock you will be in the same level than the agent13:16
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devimcstefanha, in kata the path to the target file is different13:19
devimc/usr/lib/systemd/system/kata-containers.target13:19
devimcstefanha, https://paste.fedoraproject.org/paste/5LSwt-W7Tf3sGLiYa2m6rQ13:19
devimcand this is my debug-console.service13:20
devimchttps://paste.fedoraproject.org/paste/l~BALZFI5T102W-o-5tXag13:20
stefanhadevimc: Thanks.  QEMU is terminating too quickly, I think the agent is refusing to start and the guest powers down.13:21
stefanhaI guess I'll modify the runtime to remove "nowait" from -chardev console.sock.  I want it to wait until I have the console in place :)13:22
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stefanhaQEMU is disappearing too quickly and the console output is lost.13:22
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devimcstefanha, what version of qemu are you using ?13:30
devimcstefanha, also you need to update all components13:31
devimcrunning docker or k8s?13:31
stefanhadevimc: Docker13:31
devimcumm ok that's weird13:32
devimcenable debugging and check the journal13:32
devimcsudo journalctl -b -t kata-proxy13:32
devimcsudo journalctl -b -t kata-runtime13:32
stefanhadevimc: I'm not using a stock Kata, I'm building from source and trying the Fedora rootfs.13:32
stefanhaAnd distro QEMU, so I'm not expecting things to work out-of-the-box.13:33
devimcyour host is RH ?13:33
stefanhaWas just wondering if there are smarter ways to debug than what I've been doing :)13:33
stefanhadevimc: yes13:33
devimcouch!13:33
devimcI'm not sure if RH QEMU works with kata13:37
stefanhadevimc: Right13:39
devimcif qemu version is > 2.7 it should works13:40
devimcstefanha, you could build it from source and try13:41
devimchttps://github.com/kata-containers/qemu/tree/qemu-lite-2.11.013:41
stefanhadevimc: Yes, building QEMU from source should work.13:41
jodhstefanha: the debug console info is now in the dev guide: https://github.com/kata-containers/documentation/blob/master/Developer-Guide.md#set-up-a-debug-console13:42
jodhstefanha: I'm surprised you don't get any useful messages if you've enabled *full* debug? https://github.com/kata-containers/documentation/blob/master/Developer-Guide.md#enable-full-debug13:42
* stefanha checks for agent.log=debug13:43
stefanhaI was missing agent.log=debug, thanks!13:43
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kata-dev-irc-bot<tallclair> FYI - ​I've just added a section to my sandboxes doc analyzing the ​attack surfaces that would be exposed to sandboxed pods: https://docs.google.com/document/d/1QQ5u1RBDLXWvC8K3pscTtTRThsOeBSts_imYEoRyw8A/edit#heading=h.x07ordtme9n.23:00
kata-dev-irc-bot<tallclair> Feedback on this would be very much appreciated!23:00
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